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  <title>Preliminary Plots of the CharmMeson Correlation Analysis</title>
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<font size="+4" color="#0000aa"><b>Measurement of Charm Meson Pair Cross Sections
</font>
<p><br>
</p>
We present a study of prompt charm meson pair production in p <span
 style="text-decoration: overline;">p</span> collisions
at a center-of-mass energy of 1.96 TeV. Both charm mesons of the pair
are fully reconstructed in hadronic decay modes.
Correlations of the two charm mesons are used to study heavy-quark
production dynamics.
Collionear production is found to be as important
as back-to-back production.
The measured pair cross sections are compared to a leading order matrix
element plus parton shower model (Pythia Tune A),
which gives a fair estimate of the absolute pair cross section, but
underestimates (overestimates) collinear (back-to-back)
production of charm meson pairs.
<br>
<br>
A brief summary writeup of the double charm analysis (Beauty06 Proceedings) 
<a href="cdf8621_Beauty06_CharmAtCDF.ps"> is here </a> 
<br>
<br>
This result has been first presented on the <a
 href="http://www.physics.ox.ac.uk/Beauty2006/">
Beauty 2006 Conference </a> at Oxford, UK.<br>
The <a
 href="http://www.physics.ox.ac.uk/Beauty2006/Talks/Burkard_Reisert_CDF_Charm_at_Beauty.pdf">
pdf </a> file of the talk is available
<a
 href="http://www.physics.ox.ac.uk/Beauty2006/Talks/Burkard_Reisert_CDF_Charm_at_Beauty.pdf">here
</a>.
<br>
<br>
More details of this analysis can by found in <a
 href="http://pi.physik.uni-bonn.de/teilchenseminar/teilchenseminar0607/Seminar_200610_bonn.pdf">this</a>
talk <br>
at the <a href="http://pi.physik.uni-bonn.de/teilchenseminar/">
Particle Physics Seminar </a> at the University of Bonn, Germany.<br>
<p><br>
</p>
<a name="figures">
</a>
<p><a name="figures"><big><big style="font-weight: bold;"><big>Figures
</big></big></big><br>
</a></p>
<a name="figures">Below are the eps and gif versions of the most
interesting figures:<br>
</a>
<li><a href="#cross_sections">Charm meson pair cross sections</a>
</li>
<li><a href="ccbar_addplots.html#inclusive_yields">Inclusive charm meson yields</a>
</li>
<li><a href="ccbar_addplots.html#pairyields">Yields of charm meson pairs</a>
</li>
<li><a href="ccbar_addplots.html#bvars">Variables separating prompt from secondary pairs</a>
</li>
<li><a href="ccbar_addplots.html#datamc">Data Monte Carlo Comparisons</a>
</li>
These figures superseed the 
<a href="prplots/prplots.html"> PR plots </a> of D<sup>0</sup>D*<sup>-</sup> pairs for
L = 370 pb<sup>-1</sup>
 
<p><br>
<br>
</p>
<hr><!-- -- ############################################################ --><a
 name="cross_sections"></a>
<p><a name="cross_sections"><big><big><big><span
 style="font-weight: bold;"><big>Cross Sections</big><br>
<!-- -- ############################################################ -->
</span></big></big></big></a></p>
<p><a name="cross_sections"><big><big><big><span
 style="font-weight: bold;">Integrated Cross Sections<br>
<!-- -- ############################################################ -->
</span></big></big></big></a></p>
<table style="text-align: left;"
 cellpadding="2" cellspacing="2">
  <tbody>
    <tr>
      <td style="vertical-align: top;"><a
 href="gif/DzeroDstar_xsec_sum.gif"><img
 alt="Integrated D0D*- cross section vs &Delta;&phi;"
 width=66% src="DzeroDstar_xsec_sum.gif"
 style="border: 1px solid" ;  align="left"></a>The
D<sup>0</sup>D*<sup>-</sup> pair cross section 
as function of &Delta;&phi;.
The transverse momentum , <span style="font-style: italic;">p</span><sub
 style="font-style: italic;">T</sub>, and pseudo rapidity, <span
 style="font-style: italic;">y</span>,&nbsp; ranges are given on the
plot.<br>
      <br>
The measurements (points) are compared to the leading order matrix
element plus parton shower event generator Pythia 
(<a href="http://www.phys.ufl.edu/%7Erfield/cdf/tunes/py_tuneA.html">Tune A </a>) (black line).
Also shown are the contributions of the leading order production
mechanisms flavor creation (red), flavor excitation (green) and gluon
splitting (blue).<br>
      <br>
Click here to retrieve&nbsp; 
the <a href="eps/DzeroDstar_xsec_sum.eps">eps</a> or
the <a href="gif/DzeroDstar_xsec_sum.gif">gif</a>
file of the plot. Back to <a href="#figures">list of figures</a>.<br>
      <br>
      </td>
    </tr>
    <tr>
      <td style="vertical-align: top;"><a
 href="gif/DplusDstar_xsec_sum3.gif"><img
 alt="Integrated D+D*- cross section vs &Delta;&phi;"
 width=66% src="DplusDstar_xsec_sum3.gif"
 style="border: 1px solid ;" align="left"></a>The
D<sup>+</sup>D*<sup>-</sup> pair cross section 
as function of &Delta;&phi;
The transverse momentum , <span style="font-style: italic;">p</span><sub
 style="font-style: italic;">T</sub>, and pseudo rapidity, <span
 style="font-style: italic;">y</span>,&nbsp; ranges are given on the
plot.<br>
      <br>
The measurements (points) are compared to the leading order matrix
element plus parton shower event generator Pythia (<a href="http://www.phys.ufl.edu/%7Erfield/cdf/tunes/py_tuneA.html">Tune A </a>) (black line).
Also shown are the contributions of the leading order production
mechanisms flavor creation (red), flavor excitation (green) and gluon
splitting (blue).<br>
      <br>
Click here to retrieve&nbsp; 
the <a href="eps/DplusDstar_xsec_sum3.eps">eps</a> or
the <a href="gif/DplusDstar_xsec_sum3.gif">gif</a>
file</a> of the plot. Back to <a href="#figures">list of figures</a>.<br>
      </td>
    </tr>
    <tr>
      <td style="vertical-align: top;"><br>
An additional plot of the D<sup>0</sup>D*<sup>-</sup> pair cross
section with the same trigger side D p<sub>T</sub> range as for D<sup>+</sup>D*<sup>-</sup>
pair cross section the is available in <a
 href="eps/DzeroDstar_xsec_sum3.eps">eps
      </a>and <a
 href="eps/DzeroDstar_xsec_sum3.gif">gif
      </a>format. <br>
      <br>
      </td>
    </tr>
  </tbody>
</table>
<p><a name="cross_sections"><br>
</a></p>
<!-- -- ############################################################ -->
<p><a name="cross_sections"><big><big><big><span
 style="font-weight: bold;">Differential Cross Sections<br>
<!-- -- ############################################################ -->
</span></big></big></big></a></p>
<table style="text-align: left; width: 835px; height: 533px;"
 cellpadding="2" cellspacing="2">
  <tbody>
    <tr>
      <td style="vertical-align: top;"><a
 href="gif/DzeroDstar_xsec_bins_tot.gif"><img
 alt="D0D*- cross section vs &Delta;&phi; in bins of trigger side PT"
 src="gif/DzeroDstar_xsec_bins_tot.gif"
 style="border: 1px solid ; width: 596px; height: 372px;" align="left"></a>The
D<sup>0</sup>D*<sup>-</sup> pair cross section <br>
as function of &Delta;&phi; in bins <br>
of trigger side D<sup>0</sup> p<sub>T</sub>.<br>
      <br>
The transverse momentum , <span style="font-style: italic;">p</span><sub
 style="font-style: italic;">T</sub>, and pseudo rapidity, <span
 style="font-style: italic;">y</span>,&nbsp; ranges are given on the
plot.<br>
      <br>
The measurements (points) are compared to the leading order matrix
element plus parton shower event generator Pythia (<a href="http://www.phys.ufl.edu/%7Erfield/cdf/tunes/py_tuneA.html">Tune A </a>) (black line).
      <br>
<br>
Click here to retrieve&nbsp; 
the <a href="eps/DzeroDstar_xsec_bins_tot.eps">eps</a> or
the <a href="gif/DzeroDstar_xsec_bins_tot.gif">gif</a>
file of the plot. Back to <a href="#figures">list of figures</a>.<br>
      <br>
      </td>
    </tr>
    <tr>
      <td style="vertical-align: top;"><a
 href="gif/DplusDstar_xsec_bins_tot.gif"><img
 alt="Integrated D+D*- cross section vs &Delta;&phi;"
 src="gif/DplusDstar_xsec_bins_tot.gif"
 style="border: 1px solid ; width: 596px; height: 372px;" align="left"></a>The
D<sup>+</sup>D*<sup>-</sup> pair cross section <br>
as function of &Delta;&phi; in bins <br>
of trigger side D<sup>+</sup> p<sub>T</sub>.<br>
      <br>
The transverse momentum , <span style="font-style: italic;">p</span><sub
 style="font-style: italic;">T</sub>, and pseudo rapidity, <span
 style="font-style: italic;">y</span>,&nbsp; ranges are given on the
plot.<br>
      <br>
The measurements (points) are compared to the leading order matrix
element plus parton shower event generator Pythia (<a href="http://www.phys.ufl.edu/%7Erfield/cdf/tunes/py_tuneA.html">Tune A </a>) (black line).
      <br>
Click here to retrieve&nbsp; 
the <a href="eps/DplusDstar_xsec_bins_tot.eps">eps</a> or
the <a href="gif/DplusDstar_xsec_bins_tot.gif">gif</a>
file of the plot. Back to <a href="#figures">list of figures</a>. </td>
    </tr>
  </tbody>
</table>
<p> <a name="cross_sections"><br>
</a></p>


<span style="font-weight: bold;"></span>
<hr>
<hr>
<address><a href="mailto:reisert@reisert.fnal.gov">Burkard Reisert</a></address>
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